72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/* wf_atan2.c -- float version of w_atan2.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* wrapper atan2f(y,x)
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
#include <errno.h>
|
|
|
|
#ifdef __STDC__
|
|
float atan2f(float y, float x) /* wrapper atan2f */
|
|
#else
|
|
float atan2f(y,x) /* wrapper atan2 */
|
|
float y,x;
|
|
#endif
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_atan2f(y,x);
|
|
#else
|
|
float z;
|
|
struct exception exc;
|
|
z = __ieee754_atan2f(y,x);
|
|
if(_LIB_VERSION == _IEEE_||isnanf(x)||isnanf(y)) return z;
|
|
if(x==(float)0.0&&y==(float)0.0) {
|
|
/* atan2f(+-0,+-0) */
|
|
exc.arg1 = y;
|
|
exc.arg2 = x;
|
|
exc.err = 0;
|
|
exc.type = DOMAIN;
|
|
exc.name = "atan2f";
|
|
exc.retval = 0.0;
|
|
if(_LIB_VERSION == _POSIX_)
|
|
errno = EDOM;
|
|
else if (!matherr(&exc)) {
|
|
errno = EDOM;
|
|
}
|
|
if (exc.err != 0)
|
|
errno = exc.err;
|
|
return (float)exc.retval;
|
|
} else
|
|
return z;
|
|
#endif
|
|
}
|
|
|
|
#ifdef _DOUBLE_IS_32BITS
|
|
|
|
#ifdef __STDC__
|
|
double atan2(double y, double x)
|
|
#else
|
|
double atan2(y,x)
|
|
double y,x;
|
|
#endif
|
|
{
|
|
return (double) atan2f((float) y, (float) x);
|
|
}
|
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|